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Received: from authenticated-user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1wxPrE-00BOLF-0L; Fri, 21 Aug 2026 14:04:32 +0000 Date: Fri, 21 Aug 2026 07:04:27 -0700 From: Breno Leitao To: Kiryl Shutsemau Cc: Ard Biesheuvel , Ilias Apalodimas , Miaohe Lin , Naoya Horiguchi , Andrew Morton , linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rmikey@meta.com, riel@surriel.com, kexec@lists.infradead.org, kernel-team@meta.com Subject: Re: [PATCH v2 2/6] efi: add the LINUX_EFI_POISONED_MEMORY configuration table Message-ID: References: <20260821-hwpoison-kho-v2-0-5743791e48e6@debian.org> <20260821-hwpoison-kho-v2-2-5743791e48e6@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Debian-User: leitao X-Rspamd-Queue-Id: 6AEBA80014 X-Stat-Signature: kotgeijgngqg4s6hf5f3831uipbdfnhz X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1787321081-953047 X-HE-Meta: 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 0oMVmm3+ DMirAtPqcUK8HpayYkI5CppHhmRNBCQFCeCSM3zuQS3Ra+TS9p1dxH4CCSpwdywODmakQxEtRbOYps6I34IraL5WYhocApfIHOnlPJSW+wLHYlLL1ru9KgDw2ccd1i+WZY+966aXLax8hPjgN/euRzCpvWfRgEfvqSx2DcCqCNJECuh/uECsrhCmZgYltTazSixC2DLl46K/WQrK3vkmuK+hDZEf6aasv0unlni9AeLxkdn50f+PK2RensR8t80cNvvj+oD4b3eJZ6O7nQ9fqU0x3QmC3kKVu+rz1Pp2MmFbRfptIqZw3RnuftS6eBFwN5RzHvXs4HIB3/6oNvEN7ACj/R6IkfKccqPd3Vlsx2HXIWyd7BfTvI3a3eIiL/akYC2rJ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Aug 21, 2026 at 12:51:34PM +0100, Kiryl Shutsemau wrote: > On Fri, Aug 21, 2026 at 03:06:02AM -0700, Breno Leitao wrote: > > diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig > > index 29e0729299f5b..69c0dc02bc112 100644 > > --- a/drivers/firmware/efi/Kconfig > > +++ b/drivers/firmware/efi/Kconfig > > @@ -263,6 +263,16 @@ config EFI_COCO_SECRET > > virt/coco/efi_secret module to access the secrets, which in turn > > allows userspace programs to access the injected secrets. > > > > +config EFI_POISONED_MEMORY > > + bool "Carry hardware-poisoned pages across kexec" > > + depends on EFI_STUB && MEMORY_FAILURE && 64BIT > > + help > > + Record page frames that are hardware-poisoned while this kernel runs > > + into an EFI configuration table, and honor that table early on the > > + next kernel so a kexec does not hand known-bad RAM back out. > > + > > + If unsure, say N. > > + > > Do we want to make it conditional? Maybe just for everyone with EFI_STUB > && MEMORY_FAILURE? > > Where 64BIT limitation comes from? That simplifies a bit the maths for memory operations, and make them more digestible. Do we really care about it on non 64 bits platform?